The appearance of acne on the skin after changing cosmetics is considered to be related to cosmetics, and it is advisable not to use them. It may be that the cosmetics are too greasy, thus blocking the sebaceous ducts of the hair follicles and making the pimples appear. It is also possible that the cosmetics contain glucocorticoids, which cause acne to appear. If the acne is caused by glucocorticoids, the rash is usually more uniform in size and appears red or skin-colored, sometimes with pus heads, and there are obvious red spots around the rash. It is recommended that if these conditions occur, you need to stop using cosmetics in a timely manner. It is best to take the cosmetics to a regular medical institution for a patch test to clarify whether the acne is caused by an allergic reaction to some of the ingredients in the cosmetics, if the acne is caused by allergies, it is usually accompanied by itching.